1-methylspiro[2,3-dihydro-1H-naphthalene-4,5'-imidazolidine]-2',4'-dione 、
2-溴乙酸苄酯 在
双(三甲基硅烷基)氨基钾 作用下,
以
四氢呋喃 、
N,N-二甲基甲酰胺 为溶剂,
生成 4S,4'R-benzyl (4'-methyl-2,5-dioxo-3',4'-dihydro-2'H-spiro[imidazolidine-4,1'-naphthalene]-1-yl)acetate 、 4R,4'R-benzyl (4'-methyl-2,5-dioxo-3',4'-dihydro-2'H-spiro[imidazolidine-4,1'-naphthalene]-1-yl)acetate 、 4S,4'S-benzyl (4'-methyl-2,5-dioxo-3',4'-dihydro-2'H-spiro[imidazolidine-4,1'-naphthalene]-1-yl)acetate 、 (4R,4'S)-benzyl (4'-methyl-2,5-dioxo-3',4'-dihydro-2'H-spiro[imidazolidine-4,1'-naphthalene]-1-yl)acetate